Windows executable file
application/octet-stream
⚠️
High Risk Format
This file type can contain executable code. Always validate source and scan with antivirus before opening.
Magic Bytes
Offset: 0
4D 5A
The SYS file format is a Windows executable file type developed by Microsoft for use within the Windows and MS-DOS operating systems. These files primarily function as device drivers or hardware configuration files that facilitate low-level communication between the operating system kernel and physical hardware components. Because they operate with kernel-level privileges, they pose a high security risk, as malicious code can bypass standard user security controls to gain total system access.
Validation Code
How to validate .sys files in Python
Python
def is_sys(file_path: str) -> bool:
"""Check if file is a valid SYS by magic bytes."""
signature = bytes([0x4D, 0x5A])
with open(file_path, "rb") as f:
return f.read(2) == signatureHow to validate .sys files in Node.js
Node.js
function isSYS(buffer: Buffer): boolean {
const signature = Buffer.from([0x4D, 0x5A]);
return buffer.subarray(0, 2).equals(signature);
}
Go
func IsSYS(data []byte) bool {
signature := []byte{0x4D, 0x5A}
if len(data) < 2 {
return false
}
return bytes.Equal(data[:2], signature)
}API Endpoint
GET
/api/v1/sys
curl https://filesignature.org/api/v1/sys